Zinnia seeds, different colors?

I have what is probably a silly question-I save seeds from my zinnias every year-I plant them with a couple of new packages of seeds-anyway, will the seeds saved from a pink zinnia produce the same color?
Of all the different colors I have, I only notice a few pale yellow flowers. If I want more of these, should I make sure to gather the seeds from these (yellow ones)? Thanks again